Nice thread, I’ll give it some thought, but just for fasthaggis, here’s a photo of my very own Hewlett, along with Philip Bond and Brett Emmins, drawn on the lining of a leather bike jacket:

After he’d drawn it, Jamie studied it for a few seconds, then said, “mmmm, nice eye!”
It was done at a Bristol comic shop, Forever People, on a Deadline signing tour. Jacket’s a bit tatty, but I’ll never get rid of it. 😀